Rotor brake



C. E. TACK ROTOR BRAKE Sept. l5, 1942.

5 Sheets-Sheiet l n I Filed Sept. 23, 1940 mw uw Nm. Q@ Q. ,uw QQ sw mw @WQ mm l www SN @Q m@ @Q Nw@ QS %%N l// QN www NQ Q51 W mwwww 5% @Si NNN NNN N\N @mw QN @www Q C. E. TACK ROTOR BRAKE sept, 1s, 1942.

Filed Sept. 25, 1940 3 Sheets-Sheet 2 INVENTOR. Czl/ E. ack,

C. E. TACK Sept. l5, 1942.

ROTOR BRAKE 3 Sheets-Sheet 3 Filed Sept. 23, 1940 INVENTOR, url E fach,

Patented Sept. 15, 1.942

UNET BB1 STAT OF F IC ROTDR BRKEf GarLE. Tack,- Chicago,..Ill., assignorz-tosAmeriean,

S'teeLF-oundres, Chicago, Il l.,...,acorpo1rationof New Jersey.

Application September. 23, 192102, Sirial-l`i 357,842?.JE ziclaims.. (ci. 18a-Lissywill be particularly suitableV for application to Vvlo'l trucks commonly used on. highspeed` subway cars wherein :frequent stops are required and a highly efcient fonm of braking control is-rnade necessary because of such frequenty stops-,- and the need for a high rate of-ldeceleration Another object? of my `invention is to devise` al form of rotor brake 'particularly suitable for-application to a .railway-'wheel andaxleassem-bly utilizing a known form ofresilient wheeli wherein metal tometal lcontact is-avoided-v between the 20- treadiportion of the wheeliand the hub-portion thereof; in order to.' reduce noiseandi facilitate easy riding.

My invention comprehendssucli an arrange-u mentas that described, where-i'rifra-y ring typecylinder. may be utilized, saidfcylinder-rv beingposi.-r tioned aroundthe-axle and having forrnedasV apart thereof,V means for carrying asurfaceH to be braked against an: opposing braking-surfacesupported on the wheel.

Inmy noveliarrangement; the ringpiston/associated Withthe ring cylinder is xedwithsrespeci;` tothe journalbox. within whichthe-axleAv rotates, and when the brakesare applied, thecylinderA is ,the moving parti' instead of`V thelpiston, as is more commonly the case.V In; other words, my invention contemplates/a rotor'brakef wherein a ring cylinder is movablyassociated with a. xedpiston tQoperate the braking-means;

My invention comprehendssuch antarrange-` ment asA that. described, wherein: the.4k movabley ring cylinder may bein one modification-slid`ably` supported fromthe xed'piston, andfin` another.v modification, resiliently supported? therefrom for. normal` engagementv therewith.

Figure; 1 is a sectional view` through".oneend'L ofawheelandaxle assembly, showing. one modi ncation of`v myfinvention, the section beingztakeril substantially in ther transverse verticali plane bisecting the wheeland axle assembly, a-s indi-- catedby the line of Figure 2.

Figure-2 is an-end elevation of thewheel'and` axle assembly shown inli'gure" 1, showing` also a fragmentary 4`portion ofH an associated-cartruck.

Figure 3 is a fragmentary sectional' view, taken55` in aradialpla-ne through the torque arm asse-` ciat'ed Wit-h the brake substantially as indicatedf by the line 3 3 of Figure 2.

Figure-Y 4 isatop-plan View of araiIWay/car V; truckaembodyi-ngmy invention; onlyonef-half ther` truc-kk structurehbeing shown inasmuch-` aslv the arrangement: isf similarv ati opposite sidesof the:Y

truck;

brake structure shownin' FigureA 4-.

Figure-6-is-a-fragmentary view, c0in-parabletoY that ofiFi'gurel; showing-:af-sectional-view-throughl aw brake 'arrangement generally similan to that of fthe previousmodificationx but= differing there- 151.. from inthe manner inwhich the-brakefcylinderf' isfmou-nted.

DescribingKM then structure in= greater detail; andi indeferring first: to thegeneral y' truck and brake Y arrangement' asshown in-Eigures- 41 and. 5'; the

truck@ frame-comprises the-"end -rail's -2 -andl4l andi thesidemember-` 6,1 together withspaceditram soms T; T- betweenvwhichmay beL supported" a; bolster (noti-shown) 'The said =side -membermay.

have-the usuaLpedestalineansB; 8 at opposite- 25 endssoff thettrucl for-'reception of roller bear.-

ingjourna1-boxes, generally-f designated l0', I0 forming the usualr means. ofi connection` withA spacedwheellandl axleiassemblies-e.; 9. On said boxes- I0,\ |02 may beiseated the oppositel ends4 actor-'the paired! inboard and` outboard? equalizers I2.; |21,7 and'on.sa.id equalizersmay. be supported thespaced spring. seats lll;` Ik withinwhich may: beicarried? spring groups- (noti shown). and` on said spring groupsmay be seatedat; spaced points 1 353l then top members. of.l the `side frame.

formed Withi-thegspring-seatsfI4; Illlare the braak:

ets-16, |63 serving as means for. adjustably. sup-V porting the carrier beam fonthirdmailv shoes.:r

Detail.i offV a single:- wheel. andiy axle assembly is mayi be notedthat-the saidfassembly ispofprollei` said hub having integral therewithaplate por- 45.` tion 2 4.formed on its outboard face with twoannular series' of' recesses within which may b e seated rubber pads 26, 26'A ofthe inner series;l and with' twoannular seriesy of openings' which mayf 50: be aligned' with similar series of openings ein the outboardfaeey plate orrdisle 3, the=inboardfaee of' which is likewisedafforded recessesolaneositelyv placed with-respect to whe-recesses in tha plate 24A likewise -for reception of f the outboardseries of rubberpadsZG 26 and28'gV 28,- similarfin-de Integrall'y.

sign and arrangement to those already mentioned. Clamped between the inboard and outboard series 4of rubber pads is the wheel member generally designated 32 comprising the tread portion 34 and the plate portion 36. On the opposite faces of the plate portion 36 are formed likewise two series of recesses within which may be seated said inner and outer series of rubber blocks 26 and 28 so that the two inboard series of said rubber blocks are in compression between the hub plate 24 and the wheel plate 36 and the two outboard series of rubber pads 26 and 28 are likewise in compression between the Wheel plate 36 and the outboard face plate 30 which may be press fitted as at 3| onthe outboard portion of the wheel hub. Securing bolts for retaining these parts in assembled relationship are provided in an inner annular series 38, 38 and an outer annular series 40, 40 and the said bolts may be drawn up to afford the proper degree of compression for said rubber pads to give the desired amount of rigidity to the wheel assembly.

The outer series of retaining bolts 48, 40 serve also as securing means for the rotor disk 42 which may be recessed as at 44 within the face plate 36, said rotor having a braking surface as at 46 for engagement with the brake pad or wear plate 48 secured on the annular flange 50 integrally formed with the cylinder 52, said flange being reinforced by a series of radial ribs 54, 54. As already indicated the ring type cylinder 50 is slidably positioned over the fixed ring piston 56 and between said piston and cylinder is positioned the annular packing ring 58. Into the space 66 between the packing ring 58 and the cylinder 52 compressed air may be forced by means (not shown) for actuation of the brakes.

The piston casting 56 comprises at its inner portion the radial flange 62 on which may be formed the outboard annular flange 64 which may be press fitted as at 66 into the roller bearing journal box 68 as a means of fixing the p0- sition of said piston casting. On the radially inner periphery of the radial flange 62 is formed an outboard annular flange 69 continuous with an inboard annular flange 16, said flanges 69, 'I0 being but slightly spaced from the adjacent shoulder l2 of the axle I8 in order to accommodate rotation therewithin of said axle. On the inboard annular flange 'I0 of the piston casting 56 may be press fitted as at I3 the spring assembly 14 of ring-like form with a series of projecting spring fingers 16, 'I6 whose tips may bear as at '|8, 'I8 against the inner flange B0 of the cylinder casting 52, thus affording means of restoring said cylinder to its normal position after the brakes are released.

Atop the journal box 68 may be seated as at 82 the convex base of the bearer 84, said bearer being flanged as at 86, 86 to position the equalizers |2, I2 seated thereon as at 88, 881. The journal box 68 has closure means fragmentarily shown at 80, 90.

Integrally formed with the cylinder casting 52 is the torque arm 82 and on the extremity of said torque arm may be formed a hub portion 94 within which may be pressed the bushed resilient member 86 which is seated as at 88 on the vsecuring bolt |60 and said securing bolt may extendthrough the equalizers I2, I2 and be secured thereto. It will be readily understood by those skilled in the art that the pad 96 will be placed in shear upon actuation of the cylinder 52 and that said pad will act as additional release means for said cylinder.

The modification shown in Figure 6 is generally similar to that just described but differs therefrom in the manner in which the cylinder is supported from the piston casting. In the modification now under consideration (Figure 6) the wheel hub |02 is press fitted as at |04 on the axle |06. Integrally formed with the wheel hub |02 is the plate portion |08, presenting on its outboard face an inner and an outer annular series of recesses in which may be seated the resilient pads or rubber blocks designated H0, ||0 for the inner series and ||2, II2 for the outer series. The outboard faces of inboard blocks ||0, ||0 and ||2, ||2 are seated in opposed recesses formed on the plate portion ||4 of the wheel |I6, said wheel comprising the tread portion ||8. On the opposite face of the plate portion ||4 are formed likewise, an inner and an outer series of recesses in which may be seated also the outboard rubber pads or blocks |I-8, ||0 and ||2, ||2 whose opposite faces are received in similar recesses formed on the inboard side of the face plate |20. The wheel hub |62 of the Wheel portion ||6 together with the face plate |20 and the resilient pads or rubber .blocks H0," ||2 are retained in assembly by an inner annular series of securing bolts |22, |22 and an outer annular series of securing bolts |24, |24. Said bolts may be adjusted to a tension suidcient to secure the desired rigidity of the structure as a Whole.

On the outboard face of the plate |20V is formed a slight annular recess Vwithin which may be seated as at |26 the annular flange |28 forming a portion of the rotor disk |30, said rotor disk being secured in such position by the beforementioned series of bolts |24, |24. On the outboard face of the rotor disk |30 is formed a braking surface |32 for engagement with the annular wear plate or braking pad |34 secured on the inboard face as at |36 on the annular flange |38 of the ring cylinder casting generally designated |40. The annular flange |33 is reinforced by a series of spaced ribs |42, |42, The cylinder casting |40 has sldable relationship in the usual manner with the ring piston |44 and a gasket or sealing ring is provided at |46. As in the previous modification, the ring piston |44 is fixed in position by a press fit as at |48 of the integrally formed outboard annular flange |56 within the roller bearing journal box |52. The piston casting |44 comprises also a sleeve-like central portion |54 which surrounds and has a close t, but some clearance around the shoulder |56 formed on the axle |06.

The sleeve portion |54 of the piston casting serves as a carrier for the cylinder casting, On the inboard end of the sleeve portion |54 may be press fitted as at |58 the carrier ring |60, on the outer annular surface of which may be vulcanized as at |62 the resilient ring |64, and the outer annular face of said resilient ring may be vulcanized as at |66 to the inner annular face of the cylinder casting |40. By this means the cylinder casting is held in normal position with respect to the piston and yet a degree of resilience is afforded to accommodate slight changes in position of said ring piston due to wear or other conditions affecting the roller bearing journal box within which the ring piston casting is carried as already described.

In this modification, the journal box |52 affords a seat as at |68 for the bearer |10 at each andere vice shownlwhic-hare merelyby. way of.` illustration', and. not. limitation. as: various` and?. other,

formsf. ofthe. device will, oficourse, be: apparent..

tothose; skilled.v in' the. artl without:.fdeparting1 from the 1 spirit; of the-inventionior; the. scope.

of vther claims..

I claim:V 1. In:- a. brake arrangement-.fon a. railway `oar truck, a. frame; spaced..` supportingY wheel. and axle. assemblies; and.;` brakingmeansi for. each` wheel .comprising-` atrotor. supported onnthe. outiboard faoenfgthe wheeL. a .journal boxicarried.` on the: endzofftha adjacentaxle, .airing spistomxed;

orrthe; inboard'` faoei'of :said .boxi and` comprising a--sleeye surrounding.saidzaxleg. aeresilientLmemV ber; supported: from.. said.: sleeve, a .ring cylinder: u

carried on',saidiresilient-.memberfor slidable; relationship.: with.; said?. piston, a1. stator mounted on .said cylinder, for'engagement with .saidf rotor, saidresilient membenoperating,as1releasemeans forA said cylinder, after actuation oft said Abral:e,

and;a1torque :armi-ong said cylinder; connected to saidziframe;

2'. Inabrakezarrangement; a railway car. truck..

comprising arame, spaced supportingiwheel and axle:A assemblies having journal ends, journal boxes mounted onsaidjournal, ends, and brak,- ing@4 means; for; each; wheel comprisinga.v rotor xedf. to` the wheel,J al ring. piston casting. having an annular flange press fitted.. into the adjacentA b oxwitlo a sleeve surrounding th'eadjacent: axle,.a;A ring cylinder resiliently mounted forxmovement'on said piston, ,and astator xed.. on saidi cylinder for enga-gement with .saidroton saidt.. resilient mounting. comprising a resilient ring, :fitted between said; sleeve and said ring .cyl..- inder..

3.", In ai brake arrangement,A a` railway cari truck comprising a frame, spacedisupporting wheeland axle assemblies;having'` journal ends,z equalizers extending betweensaid journal .endsat eachside of the truck, journal boxes mounted on said. journal ends, and brakingmeansor each wheel` end of thefadjacent axle, a ring piston xed on the inboard..face of saidbox and. comprising.` a sleevesurrounding said axle, a resilient member supported from saidsleeve, a. ring cylinder carried'on said` resilient member for slidable relationship with said piston, a stator mounted on said cylinder for` engagement with said rotor, and a torque' arm on said Vcylinder'connected to said frame:

5.'- Inabrake arrangementfor a railway car truck, a-vframe; spaced supporting wheel andaxle` assembliesland-braking means for each wheel comprising a-.rotor supportedon the outboard face of the wheel, a-journallbox carried on the endiofFthe-fadjacent axle, a ring-pistonxed on theiinboard :face of; said`4 box: and; comprising: a. sleevetsurroundingi said axle, alresilient` member.. supportedgfromsaidLsleeve, ,a ring. cylinder care riedLonlsaidresilient memberufor slidabl rela:- tionshiplwithusaid` piston, and:` astator mounted onr.saidf.'cylinder` for. engagement; withsaid ro.-

tor, said resilient.member operating. asrelease.

means for, said .cylinder after= actuation of.' saidf brake.

6." Ink a brake'V arrangement for arailway.: car: truck, atruck frame,A spacedisupporting. wheel andaxle: assemblies and braking. means for.. each wheel: comprising. a rotor. securedlontlie outboard face of the "wheel, a journalboxmounted on... the. end:A offthehadjacent. axle, aY ringfpiston casting having. an; annular angev press. fitted within isaidv .boxi and .'a sleeve 1 portion surrounding said.' axle, a .ringicylinderr movably. mounted onA the piston, said cylinder comprising. anxannular radiallflange; and! stator brake meansJ mounted onsaidannular flange for engagement with Asaid rotor.

7.' In a brake arrangement for. a,railway. car truck, aframe, spacedsupportingwheel and-laxle assemblies, and braking means-for each wheel` comprising a rotor-r supported ori-the outboard face of the wheel, a-jourfnal-A box carried ontlie endof the adjacentiaxle, a ringpiston -xedon the inboard face of said boxand comprising aV sleeve surroundings said axle, a resilient-member supported from-said.. sleeve, aringrcylinder carriedfon said resilientmember for` slidable relationship` `with said piston, anda stator mounted onV said cylinder for engagementwithfsaid'rotor.

8.. In a brake arrangement for a` railway car truck, atruck-` frame, spacedlsupporting wheel and. axle assemblies, and braking means-for i each wheel-comprising a rotor securedto the outboard face of the Wheel, ajournal box supported .-on-theijournal end -of-the adjacent axle, a ring piston xed on the inboardv side of-said box, a ringcylinder slidablymounted on said. ring piston and comprising a circumferential radial flange, a brake stator mounted onsaid ange opposite said rotor. for engagement therewith, and release means mounted on said ring piston for restoring said cylinder to normal position-aftery actuation of .said brakes, saidreleasemeans-comprising a resilient member mounted on said piston and encirclingsaid axle.

9. In. a railwaycar truck, a frame compris ing aside member, spacedsupporting wheel and axle assemblies having journal ends, journal boxes supported on said journal ends, and brak'- ing means for each wheel comprising a rotor on the outboard faceot the wheel, a ringpiston xed on the inboard face of the adjacent box, a ring cylinder slidably mounted with respect to said piston, a stator secured to saidcylinder for engagement with said rotor and release means for said cylinder comprising an annular resilient pad mounted on saidy piston andvulcanized Ato said cylinder.

10'. In a brake arrangement, a railway car truck comprising aV frame, spaced supporting wheel and axle assemblies having journal ends, journal boxes mounted on said 'journal ends, and braking means foreach wheel comprising a ro- Y tor xed to the wheel, a ring piston casting hav-` ing an annular ange press fitted into the adjacent boxV and a sleeve surrounding the ad jacent axle; a ring'cylinder resilientlyl mountedv for movement on said piston, anda'stator'xed 4on said cylinderionengagement with said rotor. 11iA Inla' railway car truck, a frame-comprisl` ing a side member, spaced supporting wheel and axle assemblies having journal ends, journal boxes supported on said journal ends, and braking means for each wheel comprising a rotor on the outboard face of the wheel, a ring piston fixed on the inboard face ofV the adjacent box, a ring cylinder slidably mounted with respect to said piston, a stator secured about the outer periphery of said cylinder for engagement with said rotor, and resilient means carried on said piston for release of said cylinder after actuation of said brakes, said resilient means comprising a ring member vulcanized between said piston and said cylinder.

12. In a rotor brake arrangement for a railway car truck, a frame, a supporting wheel and axle assembly comprising a wheel and an axle having a journal end, a journal box thereon, a rotor secured to said wheel, a ring piston xed on said box, a ring cylinder slidably mounted over said piston, a radial flange on said cylinder opposite said rotor, stator means fixed on said ange for engagement with said rotor, and resilient release means connected between said cylinder and said piston for release of said cylinder after actuation thereof, said release means comprising a ring-like resilient member encircling said axle between a portion of said piston and the inner periphery of said cylinder.

13. In a railway car truck, a frame comprising a side member, spaced supporting wheel and axle assembliesY having journal ends, journal boxes supported on said journal ends, and braking means for each wheel comprising a rotor sef cured on the wheel, a piston iixed'on the inboard side of the adjacent box, a cylinder slidably mounted on said piston, a stator fixed to said cylinder for engagement with said rotor, and a torque arm integrally formed with said cylinder and having a resilient connection at its remote end to said frame, said connection comprising a resilient pad formed and arranged to be placed in shear upon actuation of said cylinder.

14. In a brake arrangement for a railway car truck, a truck frame, spaced supporting wheel and axle assemblies, and braking means for each wheel comprising a rotor secured to the outboard face of the wheel, a journal box supported on the journal end of the adjacent axle, a ring piston xed on the inboard side of said box, a ring cylinder slidably mounted on said ring piston and comprising an outer radial ange, a brake stator mounted n said ilange opposite said rotor for engagement therewith, and a torque arm on said cylinder having an end remote from said cylinder resiliently connected to said frame, said connection comprising an opening in said arm, a resilient pad mounted therein and having an opening therethrough, and a rigid member received within said last-mentioned opening and secured'to said frame.

15. In a railway car truck, a frame comprising a side member, spaced supporting wheel and axle assemblies having journal ends, journal boxes supported on said journalends, and braking means for each wheel comprising a rotor on the outboard face of the wheel, a ring piston fixed on the inboard face of the adjacent box, a ring cylinder slidably mounted with respect to said piston, a stator secured to said cylinder for engagement with said rotor, and resilient release means vulcanized between said cylinder and said piston. Y

16. In a brake arrangement for a railway car truck, a truck frame, spaced supporting wheel and axle assemblies, and braking means for each wheel comprising a rotor secured to the outboard face of the wheel, a journal box supported on the journal end of the adjacent axle, a ring piston xed on the inboard side of said box, a ring cylinder movably mounted on said piston, and a brake stator integrally formed with said movable cylinder, said stator comprising a circumierential flange formed about the outer periphery of said cylinder and a plurality of radial ribs integral with said flange and said cylinder.

17. In a rotor brake arrangement for a railway car truck, a frame, a supporting Wheel and axle assembly having a journal end, a journal box thereon, a rotor secured to said wheel, a ring piston xed on said box, a ring cylinder slidably mounted over said piston, a circumferential radial ange on said cylinder opposite said rotor, stator means xed on said flange for engagement with said rotor, and release means vulcanized between said cylinder and said piston.

18. In a rotor brake arrangement for a railway car truck, a frame, a supporting wheel and axle assembly having a journal end, a journal box thereon, a rotor secured to said wheel, a ring piston fixed on said box, a movable ring cylinder mounted on said piston, a stator secured on said cylinder opposite said rotor for engagement therewith, and release means for said brake arrangement comprising a ring-like member xed on said piston around said axle, said ring-like member having its outer periphery in engagement with the inner periphery of said cylinder for movement thereof.

19. In a railway car truck, a frame comprising a side member, spaced supporting wheel and axle assemblies having journal ends, journal boxes supported on said journal ends, and braking means for each wheel comprising a rotor secured on 'the wheel, a piston fixed on the inboard side of the adjacent box, a cylinder slidably mounted on said piston, a stator xed to said cylinder for engagement with said rotor, and a release member for said braking means, said release member having its outer periphery abutting the inner periphery of said cylinder and its inner periphery supported from said piston.

20. In a rotor brake assembly, a xed ring type piston having an annular flange, a movable ring type cylinder slidably mounted on said piston, and an annular pad of resilient material Secured between said piston and cylinder and operative to release said cylinder after actuation thereof. u

21. In a rotor brake arrangement for a railway car truck, a frame, a supporting wheel and axle assembly having a journal end, a journal box thereon, a rotor secured to said wheel, a piston fixed on said box and having a portion sleeved over said axle, a cylinder encircling said axle in slidable engagement with said piston, and a stator supported about the outer periphery of said cylinder for engagement with said rotor.

22. In a rotor brake arrangement for a railway car truck, a frame, a supporting wheel and axle assembly having a journal end, a journal box thereon, a rotor secured to said wheel, a piston xed on said box and having a portion sleeved over said axle, a cylinder encircling said axle in slidable engagement with said piston, a stator supported about the outer periphery of said cylinder for engagement with said rotor, and release means encircling said axle with its respective peripheries xed to said cylinder and said piston for relative movement thereof in release of said brake arrangement.

23. In a rotor brake arrangement for a railway car truck, a frame, a supporting wheel and axle assembly having a journal end, a journal box thereon, a rotor secured to said Wheel, a piston fixed on said box and having a portion sleeved over said axle, a cylinder encircling said axle in slidable engagement with said piston, a stator supported about the outer periphery of said cylinder for engagement'l with said rotor, and releaseV means vulcanized between said cylinder and said piston operative to cause relative movement thereof after actuation of said brakes,

24. In a rotor brake assembly, a fixed ring type piston having an annular flange, a movable ring type cylinder slidably mounted on said piston, and rubber means vulcanized between said piston and the inner periphery of said cylinder and operative to release said cylinder after actuation 10 thereof.

CARL E. TACK. 

